The best clue as to the date, is the presence of the short Campagnolo Porta Catena dropouts. These were introduced in the 1979 catalog. Though the Porata Catena device itself was still offered in the 1982 catalog, the dropouts were not and both were not offered in the 1984 catalog. Campagnolo's catalogs were typically brought out for the fall trade shows, so the presence of these dropouts would indicate a 1980-1982 model, however there is also the possibility that the manufacturer bought a large supply and the frame could be slightly newer.

The frame appears to have the helical ridges in the bottom of the steerer tube, so for this period it would be either Columbus SL or SP. Given the size of the frame, SP is more likely.

This is a well made, high end frame. Were it in my possession, I would restore it properly.